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COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME | 9 Months Ended
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Sep. 30, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME | COMPONENTS OF ACCUMULATED OTHER COMPREHENSIVE INCOME Changes in AOCI attributable to our common shareholders for the nine months ended September 30, 2018 and 2017 are as follows:
| Cash Flow Hedges |  | Net Investment Hedges |  | Cumulative Translation Adjustment |  | Equity Investees |  | Pension and OPEB Adjustment |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |
Balance as at January 1, 2018 | (644 | ) | (139 | ) | 77 |  | 10 |  | (277 | ) | (973 | )
Other comprehensive income/(loss) retained in AOCI | 167 |  | (232 | ) | 1,495 |  | (8 | ) | — |  | 1,422 |
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 92 |  | — |  | — |  | — |  | — |  | 92 |
Commodity contracts 2 | (1 | ) | — |  | — |  | — |  | — |  | (1 | )
Foreign exchange contracts 3 | 6 |  | — |  | — |  | — |  | — |  | 6 |
Other contracts 4 | 10 |  | — |  | — |  | — |  | — |  | 10 |
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 36 |  | 36 |
| 274 |  | (232 | ) | 1,495 |  | (8 | ) | 36 |  | 1,565 |
Tax impact |  |  |  |  |  |  |  |  |  |  |  |
Income tax on amounts retained in AOCI | (26 | ) | 32 |  | — |  | 9 |  | — |  | 15 |
Income tax on amounts reclassified to earnings | (29 | ) | — |  | — |  | — |  | (8 | ) | (37 | )
| (55 | ) | 32 |  | — |  | 9 |  | (8 | ) | (22 | )
Balance as at September 30, 2018 | (425 | ) | (339 | ) | 1,572 |  | 11 |  | (249 | ) | 570 |
| Cash Flow Hedges |  | Net Investment Hedges |  | Cumulative Translation Adjustment |  | Equity Investees |  | Pension and OPEB Adjustment |  | Total |
(millions of Canadian dollars) |  |  |  |  |  |
Balance as at January 1, 2017 | (746 | ) | (629 | ) | 2,700 |  | 37 |  | (304 | ) | 1,058 |
Other comprehensive income/(loss) retained in AOCI | 29 |  | 496 |  | (2,616 | ) | (4 | ) | — |  | (2,095 | )
Other comprehensive (income)/loss reclassified to earnings |  |  |  |  |  |  |
Interest rate contracts 1 | 104 |  | — |  | — |  | — |  | — |  | 104 |
Commodity contracts 2 | (5 | ) | — |  | — |  | — |  | — |  | (5 | )
Foreign exchange contracts 3 | (2 | ) | — |  | — |  | — |  | — |  | (2 | )
Other contracts 4 | (3 | ) | — |  | — |  | — |  | — |  | (3 | )
Amortization of pension and OPEB actuarial loss and prior service costs 5 | — |  | — |  | — |  | — |  | 21 |  | 21 |
| 123 |  | 496 |  | (2,616 | ) | (4 | ) | 21 |  | (1,980 | )
Tax impact |  |  |  |  |  |
Income tax on amounts retained in AOCI | (9 | ) | 9 |  | — |  | 13 |  | — |  | 13 |
Income tax on amounts reclassified to earnings | (34 | ) | — |  | — |  | — |  | (8 | ) | (42 | )
| (43 | ) | 9 |  | — |  | 13 |  | (8 | ) | (29 | )
Balance as at September 30, 2017 | (666 | ) | (124 | ) | 84 |  | 46 |  | (291 | ) | (951 | )
1 | Reported within Interest expense in the Consolidated Statements of Earnings.
2 | Reported within Commodity costs in the Consolidated Statements of Earnings.
3 | Reported within Other income/(expense) in the Consolidated Statements of Earnings.
4 | Reported within Operating and administrative expense in the Consolidated Statements of Earnings.
5 | These components are included in the computation of net periodic benefit costs and are reported within Other income/(expense) in the Consolidated Statements of Earnings.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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